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jeremybenn |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - f_write</title>
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</head>
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<body>
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<div class="para">
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<h2>f_write</h2>
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<p>The f_write writes data to a file.</p>
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<pre>
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FRESULT f_write (
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FIL* <em>FileObject</em>, /* Pointer to the file object structure */
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const void* <em>Buffer</em>, /* Pointer to the data to be written */
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UINT <em>ByteToWrite</em>, /* Number of bytes to write */
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UINT* <em>ByteWritten</em> /* Pointer to the variable to return number of bytes written */
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);
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</pre>
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</div>
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<div class="para">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>FileObject</dt>
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<dd>Pointer to the open file object structure.</dd>
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<dt>Buffer</dt>
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<dd>Pointer to the data to be written.</dd>
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<dt>ByteToWrite</dt>
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<dd>Specifies number of bytes to write in range of UINT.</dd>
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<dt>ByteWritten</dt>
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<dd>Pointer to the UINT variable to return the number of bytes written. The value is always valid after the function call regardless of the result.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Return Values</h4>
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<dl class="ret">
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<dt>FR_OK (0)</dt>
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<dd>The function succeeded.</dd>
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<dt>FR_DENIED</dt>
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<dd>The function denied due to the file has been opened in non-write mode.</dd>
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<dt>FR_DISK_ERR</dt>
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<dd>The function failed due to an error in the disk function.</dd>
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<dt>FR_INT_ERR</dt>
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<dd>The function failed due to a wrong FAT structure or an internal error.</dd>
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<dt>FR_NOT_READY</dt>
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<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
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<dt>FR_INVALID_OBJECT</dt>
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<dd>The file object is invalid.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Description</h4>
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<p>The R/W pointer in the file object is increased in number of bytes written. After the function succeeded, <tt>*ByteWritten</tt> should be checked to detect the disk full. In case of <tt>*ByteWritten < ByteToWrite</tt>, it means the volume got full during the write operation.</p>
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</div>
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<div class="para">
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<h4>QuickInfo</h4>
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<p>Available when <tt>_FS_READONLY == 0</tt>.</p>
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</div>
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<div class="para">
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<h4>See Also</h4>
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<p><tt><a href="open.html">f_open</a>, <a href="read.html">f_read</a>, <a href="putc.html">fputc</a>, <a href="puts.html">fputs</a>, <a href="printf.html">fprintf</a>, <a href="close.html">f_close</a>, <a href="sfile.html">FIL</a></tt></p>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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